Tuning-fork



W. I. KIRK.

TUNING FORK.

APPLICATION FILED APR'. 4, I917.

Patented Jan. 27, 1920.,

UNITED STATES rATEnT orrron.

WALTER I. KIRK, OF CHICAGO, ILLINOIS, ASSIGNOE T0 LYON & HEALY, OFGIIIOAGQ.

ILLINOIS, A CORPORATION OF ILLINOIS.

TUNING-FORK.

Specification of Letters Patent.

Patented Jan. 27, 1920.

Application filed April 4, 1917. Serial No. 159,670.

To all whom it may concern:

Be it known that I, WALTER I. KIRK, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Tuning-Forks, of whichthe following is a full, clear, concise, and exact description,reference being had to the accompanying drawings, forming a part of thisspecification.

My invention relates to tuning forks.

One object of the invention is to provide a practical and simpleconstruction of mounted tuning fork.

Another object of the invention is to improve the efficiency of the forkand increase the facility with which it is operated.

Another object of the invention is to increase the resonating qualitiesof the device.

In the accompanying drawings Figure 1 is a front elevation partly insection of a tuning fork embodying my present invention;

Fig. 2 is a side elevation of the same; and

Fig. 3 is a cross section taken on line 3--3 in Fig. 1.

In the accompanying drawings I show a tuning fork device involving abase member 1 in the form of a hollow drum having feet 22 on which thedevice may be supported. The drum 1 is provided with an aperture 3 inthe center of its upper wall or top 1. Mounted upon the drum 1 is aframe preferably consisting of two upright members or standards 55located on opposite sides of th central aperture 3. These members 5 areconnected to the drum 1 by suitable securing means as for example bolts6-6 extending through the bottom of the drum and up through the top 4:of the same and provided with projecting threaded ends 7 which fit intothe lower ends of the standards 5. The standards 5 preferably form thelower portions of a supporting structure consisting of said standards 5and an upper connecting element 8, which is conveniently secured to themembers 5 by threaded studs 9 projecting from the members 5. The member8 supports a tuning fork 10 which extends down between the standards 5close to the top 4 of the drum 1 so that the lower ends of said fork arin close proximity to the aperture 3. The fork 10 is hung in theconnecting piece or top 8 by means of a bolt 12 passing through theupper end of the fork and also through the walls of said piece 8 andhaving a nut 14: at one end of the same. The other end of the bolt 12 ispreferably made with prongs 15 which serve as supports for a striker 16having a handle 17 and a striking end piece 18. Thus the tuning fork issuspended in an upright position with: unobstructed space on each sideso that either prong may b struck and also so that when struck the forkis free to vibrate as much as necessary without striking any otherobject or article or part of the device. At the same time both prongsare in proximity to the resonator or drum 1 and the air aperture 3thereof so that the maximum effect may be secured from said resonator.

It will be understood that changes and modifications may be made withoutdeparton and rising from the top of said resonator on opposite sides ofsaid aperture, a connecting piece at the upper ends of said standards,and a tuning fork having its upper end attached to said connecting pieceand extending downwardly from the same between said supports, the lowerends of the prongs being located above and adjacent to said aperture.

3. A device of the class specified comprising a resonator in the form ofa vertically arranged cylindric hollow drum having its top provided witha central aperture, uprights having their lower ends resting on the topof said drum on opposite sides of said aperture, bolts extending throughthe drum and into the lower ends of said uprights for securing the sameto the drum, a connecting piece secured to the upper ends of saiduprights and connecting the same together, said connecting piece beingprovided with a socket, a tuning fork having one end set in said socketand having its prongs extending downwardly between said uprights toproximity to the top of said drum, and a bolt extending through saidconnecting piece and embedded end of the tuning fork for holding thesame in position.

4. A device of the class specified comprising a resonator in the form ofa cylindric hollow drum having its top provided with a central aperture,uprights having their lower ends resting 011 the top of said drum onopposite sides of said aperture, bolts extending through the drum andinto the lower ends of said uprights for securing the same to the drum,a connecting piece secured to the upper ends of said uprights andconnecting the same together, said connecting piece being provided witha socket, a tuning fork having one end set in said socket and having itsprongs extending downwardly between said uprights to proximity to thetop of said drum, and a bolt extending through said connecting piece andembedded end of the tuning fork for holding the same in position, oneend of said bolt being provided with prongs to form a support for astriker.

5. A device of the class specified comprising a resonator, a supportingdevice mounted on the resonator and comprising separated standards oruprights, said resonator having an aperture between said standards, atuning fork mounted at the upper ends of said standards and extendingdownwardly therefrom so that the free ends of the prongs are adjacentsaid aperture, and a support for a tuning fork striker also mounted atthe upper ends of said standards.

(5. A device of the class specified comprising a resonator having itstop provided with an aperture, supporting standards mounted on andrising from the top of said resonator on opposite sides of saidaperture, a connecting piece at the upper ends of said standards, atuning fork having its upper end attached to said connecting piece andextending downwardly from the same between said supports, the lower endsof the prongs being located above and adjacent to said aperture, and asupport for a tuning fork striker also mounted at the upper ends of saidstandards.

7. A device of the class specified comprising a resonator, supportingmembers mounted upon the top of said resonator and extending upwardlytherefrom, a tuning fork supported by said supporting members and asupport for holding a tuning fork striker, said support being alsomounted upon said upwardly extending supporting members.

In witness whereof, I hereunto subscribe my7na1ne this 27th day ofFebruary, A. D., 191

A. L. JoNEs, O. M. WERMIOH. p

